检索结果-南通市图书馆

维普期刊数据库博看期刊

Bifunctional 3D n-doped porous carbon materials derived from paper towel for oxygen reduction reaction and supercapacitor

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2018年第10期63卷 621-628页

作者： Xinyu Gao Xueyan Li Zhuang Kong guozheng xiao Ying Zhu Key Laboratory of Bio-inspired Smart Interracial Science and Technology of Ministry of Education School of Chemistry Beihang University. Belting 100191. China Beijing Advanced Innovation Center for Biomedical Engineering Beihang University. Beijing 100191 China

Designing and fabricating cheap and active bifunctional materials is crucial for the development of renewable energy *** this article,three-dimensional nitrogen-doped porous carbon materials(NDPC-X,in which X represents the pyrolysis temperature) were fabricated by simultaneous carbonization and activation of polypyrrole-coated paper towel protected by a silica layer followed by acid *** material had a high specific surface area(1,123.40 m^2/g).The as-obtained NDPC-900 displayed outstanding activity as a catalyst for the oxygen reduction reaction(ORR) as well as an electrode with a high specific capacitance in a supercapacitor in an alkaline *** NDPC-900 catalyst for the ORR exhibited a more positive reduction peak potential of à0.068 V(***|HgCl^2) than that of Pt/C(-0.121 V),as well as better cycling stability and stronger methanol ***,the NDPC-900 had a high specific capacitance of 379.50 F/g at a current density of 1 A/g,with a retention rate of 94.5% after 10,000 cycles in 6 mol/L KOH electrolyte when used as an electrode in a *** these results were attributed to the effect of a large surface area,which provided electrochemically active *** work introduces an effective way to use biomass-derived materials for the synthesis of promising bifunctional carbon material for electrochemical energy conversion and storage devices.

关键词： Paper towel Nitrogen-doped carbon Oxygen reduction reaction Supercapacitor

Natural tea-leaf-derived, ternary-doped 3D porous carbon as a high-performance electrocatalyst for the oxygen reduction reaction

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第5期9卷 1244-1255页

作者： Zhaoyan Guo Zhen xiao Guangyuan Ren guozheng xiao Ying Zhu Liming Dai Lei Jiang Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry and Environment Beihang University Beijing 100191 China Department of Macromolecular Science and Engineering Case Western Reserve University Cleveland 10900 USA Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

To commercialize fuel cells and metal-air batteries, cost-effective, highly active catalysts for the oxygen reduction reaction （ORR） must be developed. Herein, we describe the development of low-cost, heteroatom （N, P, Fe） ternary-doped, porous carbons （HDPC）. These materials are prepared by one-step pyrolysis of natural tea leaves treated with an iron salt, without any chemical and physical activation. The natural structure of the tea leaves provide a 3D hierarchical porous structure after carbonization. Moreover, heteroatom containing organic compounds in tea leaves act as precursors to functionalize the resultant carbon frameworks. In addition, we found that the polyphenols present in tea leaves act as ligands, reacting with Fe ions to form coordination compounds; these complexes acted as the precursors for Fe and N active sites. After pyrolysis, the as-prepared HDPC electrocatalysts, especially HDPC-800 （pyrolyzed at 800℃）, had more positive onsets, half-wave potentials, and higher catalytic activities for the ORR, which proceeds via a direct four-electron reaction pathway in alkaline media, similar to commercial Pt/C catalysts. Furthermore, HDPC-X also showed enhanced durability and better tolerance to methanol crossover and CO poisoning effects in comparison to commercial Pt/C, making them promising alternatives for state-of-the-art ORR electrocatalysts for electrochemical energy conversion. The method used here provides valuable guidelines for the design of high-performance ORR electrocatalysts from natural sources at the industrial scale.

关键词： green tea leaves oxygen reduction catalysts,heteroatoms doped hierarchically porous carbon,synergistic effect

A bio-inspired Co304-polypyrrole-graphene complex as an efficient oxygen reduction catalyst in one-step ball milling

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2015年第11期8卷 3461-3471页

作者： Guangyuan Ren Yunan Li Zhaoyan Guo guozheng xiao Ying Zhu Liming Dai Lei Jiang Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of Chemistry and Environment Beihang University Beijing 116023 China School of Chemistry Biology and Materials Science East China Institute of Technology Nanchang 330013 China Department of Macromolecular Science and Engineering Case Western Reserve University Cleveland Ohio 44106 USA

The development of non-precious metal-based electrocatalysts has attracted much research attention because of their high oxygen reduction reaction （ORR） activities, low cost, and good durability. By one-step in-situ ball milling of graphite, pyrrole, and cobalt salt without resorting to high-temperature annealing, we developed a general and facile strategy to synthesize bio-inspired cobalt oxide and polypyrrole coupled with a graphene nanosheet （Co3O4-PPy/GN） complex. Herein, the exfoliation of graphite and polymerization of pyrrole occurred simultaneously during the ball milling process. Meanwhile, the Co3O4 and Co-Nx ORR active sites were generated from the oxidized cobalt ion, cobalt-PPy, and the newly exfoliated graphene nanosheets via strong π-π stacking interactions. The resultant Co3O4-PPy/GN catalysts showed efficient electrocatalytic performances for ORRs in an alkaline medium with a positive onset and reduction potentials of -0.102 and -0.196 V （vs. Ag/AgCl）, as well as a high diffusion-limited current density （4.471 mA·cm^-2）, which was comparable to that of a Pt/C catalyst （4.941 mA·cm^-2）. Compared to Pt/C, Co3O4-PPy/GN catalysts displayed better long-term stability, methanol tolerance, and anti-CO-poisoning effects, which are of great significance for the design and development of advanced non-precious metal electrocatalysts.

关键词： graphene cobalt-polypyrrole oxygen reduction reaction electrocatalysts ball milling

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于物性结构的事件演化语义模型

语言科学 2017年第4期16卷 361-371页

作者：陈禹萧国政武汉大学文学院湖北武汉430072 湖北省语言与智能信息处理研究基地湖北武汉430072

事件演化即事件在篇章中依次变化,是篇章推进的主要手段。结合物性结构理论,同一话题下与不同话题间事件演化可构建出一套语义模型,该语义模型着重刻画事件间基于词汇语义的内部语义联系,并说明物性结构与题元结构的协同作用对事件演化... 详细信息

事件演化即事件在篇章中依次变化,是篇章推进的主要手段。结合物性结构理论,同一话题下与不同话题间事件演化可构建出一套语义模型,该语义模型着重刻画事件间基于词汇语义的内部语义联系,并说明物性结构与题元结构的协同作用对事件演化提供的语义触发动力与制约机制。

关键词：事件演化物性结构题元角色语义模型

在线全文

学校读者我要写书评

暂无评论

事件转喻及其基本类型与篇章限制

当代修辞学 2019年第3期 51-60页

作者：陈禹萧国政华中科技大学中文系武汉430074 武汉大学文学院武汉430072

转喻是人类最基本的认知模式之一。除了实体转喻之外,事件转喻也经常出现在语言之中。区别于语义蕴涵、语用推理与特殊命名,事件转喻具有认知域的相互独立性、投射的偶然性和源域的可还原性。事件转喻的基本类型有二:事件要素转喻和相... 详细信息

转喻是人类最基本的认知模式之一。除了实体转喻之外,事件转喻也经常出现在语言之中。区别于语义蕴涵、语用推理与特殊命名,事件转喻具有认知域的相互独立性、投射的偶然性和源域的可还原性。事件转喻的基本类型有二:事件要素转喻和相关事件转喻。前者是事件的一部分转喻事件,后者动用了物性结构机制。事件转喻的产生受到篇章因素的限制,这些限制因素包括指别度差异与非正式语体的倾向。

关键词：事件转喻伪定语物性结构指别度非正式语体

Rethinking development and major research plans of Industrial Internet in China

在线全文

学校读者我要写书评

暂无评论

Fundamental Research 2024年第1期4卷 3-7页

作者： Chunxiao Jiang Yang Cong Jiming Chen Chenghong Wang guozheng Wu Ruizhen Zhao Zhiheng Wang Bin xiao Ting Chen Beijing National Research Center for Information Science and Technology Tsinghua UniversityBeijing 100084China Tsinghua Space Center Tsinghua UniversityBeijing 100084China State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China College of Control Science and Engineering Zhejiang UniversityHangzhou 310027China Division III Department of Information SciencesNational Natural Science Foundation of ChinaBeijing 100085China Division II Department of Information SciencesNational Natural Science Foundation of ChinaBeijing 100085China Chongqing Key Laboratory of Image Cognition School of Computer Science and TechnologyChongqing University of Posts and TelecommunicationsChongqing 400065China University of Electronic Science and Technology of China Chengdu 611731China

This paper gives a definition of the Industrial Internet and expounds on the academic connotation of the future Industrial *** this foundation,we outline the development and current status of the Industrial Internet in China and ***,we detail the avant-garde paradigms encompassed within the National Natural Science Foundation of China(NSFC)’s“Future Industrial Internet Fundamental Theory and Key Technologies”research plan and its corresponding management *** research initiative endeavors to enhance interdisciplinary collaborations,aiming for a synergistic alignment of industry,academia,research,and practical *** primary focus of the research plan is on the pivotal scientific challenges inherent to the future industrial *** is poised to traverse the“first mile”,encompassing foundational research and pioneering innovations specific to the industrial internet,and seamlessly bridges to the“last mile”,ensuring the effective commercialization of scientific and technological breakthroughs into tangible industrial market *** anticipated contributions from this initiative are projected to solidify both the theoretical and practical scaffolding essential for the cultivation of a globally competitive industrial internet infrastructure in China.

关键词： Industrial Internet Academic connotation Major research plan Scientific problem Policy advice

从社交常用语的使用看新加坡华族的语言选择及其趋势

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

语言文字应用 2000年第3期 40-45,90页

作者：萧国政徐大明华中师范大学文学院湖北武汉430079 新加坡南洋理工大学中华语言文化中心

新加坡是比较典型的多元文化和多种语言的社会。文章以最近的社会语言学的调查为据 ,讨论新加坡华族的语言价值观、常用语选择状况和可能性趋势 ,探索社会因素和语言使用现状之间的关系。同时 ,文章还探讨了社会语言学关于社会变量的理... 详细信息

新加坡是比较典型的多元文化和多种语言的社会。文章以最近的社会语言学的调查为据 ,讨论新加坡华族的语言价值观、常用语选择状况和可能性趋势 ,探索社会因素和语言使用现状之间的关系。同时 ,文章还探讨了社会语言学关于社会变量的理论。为了使社会语言学关于变量和语言状况之间复杂关系的探索更具可操作性和表述上的简明性 ,本文提出了可标变量度、起始性可标变量等一系列新的概念。

关键词：语言价值观语言选择社会变量

在线全文

学校读者我要写书评

暂无评论

汉语语义场网络中的无标度分布现象

中文信息学报 2015年第3期29卷 34-43页

作者：杨华姬东鸿萧国政贵州师范大学数学与计算机科学学院贵州贵阳550001 武汉大学文学院湖北武汉430070 武汉大学计算机学院湖北武汉430070

语义场是词语意义联系在一起构成的语义系统。一门语言的所有子语义场合在一起,就是该语言的语义场。探索用复杂网络来表示汉语的语义场,基于联想场的概念,该文提出用复杂网络表示汉语的语义场。该网络的节点度,节点权值与边权值均服从... 详细信息

语义场是词语意义联系在一起构成的语义系统。一门语言的所有子语义场合在一起,就是该语言的语义场。探索用复杂网络来表示汉语的语义场,基于联想场的概念,该文提出用复杂网络表示汉语的语义场。该网络的节点度,节点权值与边权值均服从无标度分布。展示结点度、结点权值、边权值在一定范围的内容,观察到一些在网络视角才能发掘出的现象。该文将较特别的现象展示给语言学界的专家们,期望引起共鸣,得到对这些现象的更合理解释。

关键词：语义场复杂网络无标度分布

语法事件与语义事件——面向人工智能的语言研究

在线全文

学校读者我要写书评

暂无评论

长江学术 2020年第2期 83-98页

作者：萧国政武汉大学文学院湖北武汉430072

本文是智能语言学的语法事件和语义事件研究。语法事件是关涉语言生成的事件,语义事件是关乎自然语言意义理解的事件,语法事件讨论谓语动词的事件索引类型、语法功能以及不同索引类谓词的类意义赋值,语义事件讨论其不同哲学空间的表现,... 详细信息

本文是智能语言学的语法事件和语义事件研究。语法事件是关涉语言生成的事件,语义事件是关乎自然语言意义理解的事件,语法事件讨论谓语动词的事件索引类型、语法功能以及不同索引类谓词的类意义赋值,语义事件讨论其不同哲学空间的表现,不同语法单位的事件语义理解和结构化,并同时观照语言事件研究中溢现的人类智能表现。

关键词：语法事件语义事件智能语言学语言结构化新戴维森分析法+